Donald Trump was warned in the weeks after he won the Republican presidential nomination in July 2016 that foreign adversaries — including Russians — would try to spy on and infiltrate his campaign.

The warning was a high-level counterintelligence briefing by senior FBI officials, NBC reported Monday.

The Clinton campaign, which did not respond to a request for comment, also received a similar briefing.

According to NBC, the briefings were timed to occur around when each presidential candidate was to receive classified intelligence information. Trump’s first intelligence briefing as the GOP nominee was Aug. 17, 2016.

At that session, Trump was “briefed and warned” about threats from Russia, but it was unclear if the warning was given to other campaign officials.

"That the Republican and Democrat nominee for President received a standardized briefing on counter-intelligence is hardly a news story," said Raj Shah, a White House spokesman. "That NBC News hears about the contents of this classified conversation due to an inappropriate leak is a news story."

At least seven campaign officials had been in contact with Russians or people linked to Russia, according to news reports. NBC said the FBI asked Trump's team to alert the agency to any "suspicious overtures" from Russia, but it's not clear if any of those contacts were reported.